Thrust force reactions in an automatic transmission

a technology of automatic transmission and thrust force, which is applied in the direction of gearing details, gearing, transportation and packaging, etc., can solve the problems of significant frictional loss and adversely affect fuel economy

Active Publication Date: 2016-03-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution eliminates the need for thrust bearings, reducing frictional losses and improving fuel economy by effectively managing thrust loads across high speed differentials.

Problems solved by technology

That high speed differential across a thrust bearing causes significant frictional loss and adversely affects fuel economy.

Method used

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  • Thrust force reactions in an automatic transmission
  • Thrust force reactions in an automatic transmission
  • Thrust force reactions in an automatic transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017]The assembly 10FIG. 1 includes an input 12; output 14; intermediate shaft 16; a first planetary gear set 20 having a first sun gear 22, a first ring gear 24, a first carrier 26; and a set of planet pinions 30 supported on carrier 26 and in continuous meshing engagement with the sun gear 22 and the ring gear 24.

[0018]A second planetary gear set 32 includes a second sun gear 34 fixedly coupled to sun gear 22; a second ring gear 36; a second carrier 38 fixedly coupled to the input 12; and a set of planet pinions 40 in supported on carrier 38 and in continuous meshing engagement with sun gear 34 and ring gear 36.

[0019]A third planetary gear set 42 includes a third sun gear 44 fixedly coupled to ring gear 36; a third ring gear 46; a third carrier 48; and a set of planet pinions 50 supported on carrier 48 and in continuous meshing engagement with sun gear 44 and ring gear 46.

[0020]A fourth planetary gear set 52 includes a fourth sun gear 54 fixedly coupled to ring gear 46; a fourth ...

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Abstract

A system producing force reactions in a transmission includes a case including front and rear surfaces, a reaction component, a gearset including a ring gear and a sun gear that transmits a forward force to the front surface, a first path for transmitting a rearward force from the ring gear to the rear surface, a second path for transmitting a forward force from the ring gear to the reaction component, and a third path for transmitting a rearward force from the sun gear to the reaction component.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates generally to an apparatus for producing thrust force reactions in an automatic transmission, particularly such forces due to transmitting torque between meshing helical gear teeth.[0003]2. Description of the Prior Art[0004]In an automatic transmission a planet pinion carrier supports a set of planet pinions, each member of the set being engaged with a sun gear and a ring gear. Typically, an axial force component, i.e., thrust load, produced due to the helix angle of the meshing gears and pinions and torque transmitted between them, is captured between the sun gear and the ring gear. Thrust load from the sun gear is directed at the ring gear hub, and the thrust load from the ring gear hub is directed at the sun gear. This allows the thrust loads to be cancelled, i.e., reacted by a force of equal magnitude and opposite direction.[0005]Between the ring gear hub and the sun gear hub, a thrust needle b...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): F16H57/08F16H3/66F16H57/021
CPCF16H57/08F16H3/66F16H2057/0216F16H2200/0052F16H2200/2012
InventorTHOMAS, STEVEN, G.GOLESKI, GREGORY, D.MAURER, JEFFREY, E.
OwnerFORD GLOBAL TECH LLC